Electric control device



July 10, 1926. 1,676,671

G. F. SCHWARTZ ELECTRIC CONTROL DEVICE Original Filed Feb. 25, i921 jwumMoo (iii! aizwariz attorney,

Patented July 10, 1928.

UNITED STATES GERHARDT F. SCHWARTZ, OF ST. LOUIS, MISSOURI.

ELECTRIC CONTROL DEVICE. 7

Original application filed February 25, 1921, Serial No. 447,664.Divided and this application filed- October 28, 1922.

The present invention relates to improvements in electric controldevices for auto-' matic gas appliances and it consists in a division ofmy co-pending application, Se-

! rial Number 447,664, filed February 25, 1921. It is an object of thepresent invention to provide for the automatic closing of the valveswhich govern the supply of gas to pilot burners, whenever, for anyreason, the

10 pilot flame becomes extinguished; tothe end that the disagreeable andnoxious odors pilot from which the main burner becomes ignited wheneverthe services of the appliances are called into play. This flame is ofcourse small to reduce as much as possible the consumption of gas and byreasons of unevennesses in the flow, temporary clogging of the gas pipe,or for many other reasons, such as drafts of air, this pilot becomesextinguished while the gas is allowed to flow on and escape into thebuilding.

It is the purpose of the invention to provide for the closing of the gascontrolled valve by thermostatic means coupled with an electricallyoperated device and in some cases 3 with an audible signal to make itknown that the pilot light has gone out and as a' consequence that itwill be impossible to start the main burner.

With the foregoing and otherobjects in 0 view, the invention will bemore fully described hereinafter, and will be more particularly pointedout in the c-laimappended'.

hereto.

In the drawing, the single figure shows a side view, with partsindicated diagrammatically, of a device constructed according to thepresent invention.

The thermostat bar 90 is shown as ar ranged alongside the burner 6 andas being so pivoted, at-91, near the pivoted end of the switch arm 92.Such switch arm is pivoted to the burner elbow or to-some fixed supportand the contact free end of the switch arm 92 i is disposed through avertically elongated 66 slot in the side of a housing containing theSerial No. 597,567.

spring 96 for normally urging the contact arm 92 upwardly to close thetwo spaced contacts in the upper part of the housing.- These contactsare in a circuit 81, 82 containing the source of electromotive force 80.In the circuit is also the primary of a transformer 83', the secondaryof which is in circuit with the audible alarm or bell 83 and thesolenoid winding 73. The bell and solenoid winding are in parallel. Thearmature 76 for the solenoid is suspended by a cord or flexibleconnection 77 above the core of the solenoid. The cord 77 passes over apair of horizontally spaced pulleys 78 and extends down at its other endto the external swinging arm 79 of the Valve 11 for controlling the flowof gas to the burner ,6.

In operation, the burner 6 may be ignited only after the valve 11 isopened and this is accomplished by swinging the handle 79 75 manuallydown to the horizontal position, which elevates the armature 76 throughthe flexible connection 77. The heat from the burner elongates thethermostatic bar 90 causing movement of theswitch arm 92 to open thecircuit. This condition prevails until the burner is extinguished,whereupon the thermostatic bar will contract drawing with it the switcharm 92 and causing closing of the circuit 81, 82, whereby the audiblesignal 83 and solenoid 73 will be energized in a well known manner. Theenergizing of the solenoid 73 will result in the drawing down orattraction of the armature 76, the pulling upon the cord 77 and theconsequent swinging of the valve arm 79 upwardly to close the valve 11and prevent the escape of the gas.

It will be noted that the contacts and the means for bridging or closingthe contacts are located away from the zone of the flame and its heat. a

It is obvious that. various changes and modifications may be made in thedetails of construction and design of the above specifically describedembodiment of this inven tion without departing from'the spiritthereof,such changes and modifications being restricted only by the scope of thefollowing claim. 1 5

What is claimed is: p

In a safety control for gas appliances, the combination of a pilotburner, a valve controlling the supply of gas to the burner,

a thermostat disposed so as to a t n ne direction in" the presence ofthe flame on the ing located away from the zone of the flame 10 pilotburner and. to react in the absence of and its heat, said thermostatbeing disposed such flame, a solenoid for closing said valve, relativelyto said last named means, whereby the core of said solenoid connected bya fiexto cause closing of the contacts upon the ible element trainedover pulleys to a handle extinguishing of the pilot flame.

of the valve, an electric circuit including In testimony that I claimthe foregoing 15 said solenoid and having normally open conas myinvention I have signed my name heretacts therein, means for bridgingsaid conunder.

tacts, said contacts and bridging means be- GERHARDT F. SCHWARTZ.

